The case may not have enough room and the power supply definately wont have the power to do so. You will need 1 or 2 6pin power chords running to it, the psu in this dell probably has none. The dell may have 4 pin model connectors, there are adapters that take 2x 4pin molex connectors and make them into 2x 6 pin for graphics cards. My suggestion is start over with a new psu and case. A nice case for beginners is the nzxt source 210, its not the most stylish, but plenty of room and airflow options. Also pick up a 500-600w psu to be safe, 80plus bronze is preferable, seasonic and coraire are great, i'd recomment a cx500 or cx600. This will run you $80-100, the resale value of your case and psu from dell is slim to nothing.